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(c) The capacity of the Critical Flood Zone to store and convey surface waters or perform other significant water management functions will not be impaired. (14) If the development project is in a Coastal High Hazard Zone, it must be demonstrated, in addition to compli- ance with Paragraphs 1 through 13, that: (a) All buildings or structures shall be elevated so that the lowest horizontal supporting member is located no lower than the Flood Protection Elevation, with all space below the lowest horizontal supporting member open so as not to impede the flow of water. Beach dune type fill may be placed beneath the structure provided that the fill would not enhance erosion on neighboring property and is designed to be compatible with surrounding topography and does not result in latteral forces for which the foundation has not been designed. Such space shall not be used for human habitation nor enclosed in the future. Lattice work, Ot decorative screening, or native beach fill may be construct- ed below the flood protection elevation provided it is not part of the structural support of the building and is designed so as to break away, under abnormally high tides or wave action, without damage to the structural integrity of the building. Solid walls will not be allowed. Only wood or mesh screening may be used. (b) Pilings or columns shall be used as struc- tural supports and shall be designed and anchored to with- stand all applied loads of the regulatory flood including velocity flow and hurricane wave wash. Piling embedment must be designed to provide for scour, erosion, and loss of soil below design grade. Fill must not be used as struc- tural support. Compliance with these provisions must be certified by a Florida registered Professional Engineer. (c) Sand dunes or mangrove stands are not altered so as to increase potential flood damage. SECTION 7 C. STORMWATER MANAGEMENT PERMIT (TYPE C) A Type "C" Permit or Flood Protection Permit is required prior to the construction of an individual detached single family residence, duplex residence or accessory structure which is located in a Flood Hazard Zone as defined in Section 7A(19)(a-f). The Type "C" Permit shall be issued upon the applicant demonstrating compliance with Section 7B(1-14)* SECTION 8 REQUIRED INFORMATION FOR PERMIT APPLICATIONS A. Type A Permit - A detailed description and drawing (scale 1"=50' or larger) of the proposed stormwater manage- ment system shall be submitted to the Community Development Director by a Florida registered engineer or, for any development project constructed on a site of 1.00 acre or less, a Florida registered architect as long as any engi- neering service involved in the design is purely incidental